15191139 has 4 divisors (see below), whose sum is σ = 20254856. Its totient is φ = 10127424.

The previous prime is 15191131. The next prime is 15191159. The reversal of 15191139 is 93119151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93119151 = 3 ⋅31039717.

It is not a de Polignac number, because 15191139 - 2³ = 15191131 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (15191131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2531854 + ... + 2531859.

It is an arithmetic number, because the mean of its divisors is an integer number (5063714).

Almost surely, 2^15191139 is an apocalyptic number.

15191139 is a deficient number, since it is larger than the sum of its proper divisors (5063717).

15191139 is an equidigital number, since it uses as much as digits as its factorization.

15191139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063716.

The product of its digits is 1215, while the sum is 30.

The square root of 15191139 is about 3897.5811729841. The cubic root of 15191139 is about 247.6643210395.

The spelling of 15191139 in words is "fifteen million, one hundred ninety-one thousand, one hundred thirty-nine".